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Mon, 22 Jan 2024 11:37:38 -0800 (PST) Received: from localhost.localdomain ([147.235.201.119]) by smtp.gmail.com with ESMTPSA id jb13-20020a05600c54ed00b0040e418494absm39138945wmb.46.2024.01.22.11.37.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jan 2024 11:37:37 -0800 (PST) From: Tony Solomonik To: axboe@kernel.dk, asml.silence@gmail.com, io-uring@vger.kernel.org Cc: Tony Solomonik Subject: [PATCH 1/2] io_uring: add support for truncate Date: Mon, 22 Jan 2024 21:37:31 +0200 Message-Id: <20240122193732.23217-1-tony.solomonik@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Libraries that are built on io_uring currently need to maintain a separate thread pool implementation when they want to truncate a file. --- include/uapi/linux/io_uring.h | 1 + io_uring/Makefile | 2 +- io_uring/opdef.c | 8 ++++++ io_uring/truncate.c | 53 +++++++++++++++++++++++++++++++++++ io_uring/truncate.h | 4 +++ 5 files changed, 67 insertions(+), 1 deletion(-) create mode 100644 io_uring/truncate.c create mode 100644 io_uring/truncate.h diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index f1c16f817742..513f31ee8ce9 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -253,6 +253,7 @@ enum io_uring_op { IORING_OP_FUTEX_WAIT, IORING_OP_FUTEX_WAKE, IORING_OP_FUTEX_WAITV, + IORING_OP_TRUNCATE, /* this goes last, obviously */ IORING_OP_LAST, diff --git a/io_uring/Makefile b/io_uring/Makefile index e5be47e4fc3b..4f8ed6530a29 100644 --- a/io_uring/Makefile +++ b/io_uring/Makefile @@ -8,6 +8,6 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \ statx.o net.o msg_ring.o timeout.o \ sqpoll.o fdinfo.o tctx.o poll.o \ cancel.o kbuf.o rsrc.o rw.o opdef.o \ - notif.o waitid.o + notif.o waitid.o truncate.o obj-$(CONFIG_IO_WQ) += io-wq.o obj-$(CONFIG_FUTEX) += futex.o diff --git a/io_uring/opdef.c b/io_uring/opdef.c index 799db44283c7..60827099e244 100644 --- a/io_uring/opdef.c +++ b/io_uring/opdef.c @@ -35,6 +35,7 @@ #include "rw.h" #include "waitid.h" #include "futex.h" +#include "truncate.h" static int io_no_issue(struct io_kiocb *req, unsigned int issue_flags) { @@ -469,6 +470,10 @@ const struct io_issue_def io_issue_defs[] = { .prep = io_eopnotsupp_prep, #endif }, + [IORING_OP_TRUNCATE] = { + .prep = io_truncate_prep, + .issue = io_truncate, + }, }; const struct io_cold_def io_cold_defs[] = { @@ -704,6 +709,9 @@ const struct io_cold_def io_cold_defs[] = { [IORING_OP_FUTEX_WAITV] = { .name = "FUTEX_WAITV", }, + [IORING_OP_TRUNCATE] = { + .name = "TRUNCATE", + }, }; const char *io_uring_get_opcode(u8 opcode) diff --git a/io_uring/truncate.c b/io_uring/truncate.c new file mode 100644 index 000000000000..82648b2fbc7e --- /dev/null +++ b/io_uring/truncate.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "../fs/internal.h" + +#include "io_uring.h" +#include "truncate.h" + +struct io_trunc { + struct files *file; + char __user *pathname; + loff_t len; +}; + +int io_truncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_trunc *tr = io_kiocb_to_cmd(req, struct io_trunc); + + if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + tr->pathname = u64_to_user_ptr(READ_ONCE(sqe->addr)); + tr->len = READ_ONCE(sqe->len); + + req->flags |= REQ_F_NEED_CLEANUP; + req->flags |= REQ_F_FORCE_ASYNC; + return 0; +} + +int io_truncate(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_trunc *tr = io_kiocb_to_cmd(req, struct io_trunc); + int ret; + + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); + + ret = do_sys_truncate(tr->pathname, tr->len); + + req->flags &= ~REQ_F_NEED_CLEANUP; + io_req_set_res(req, ret, 0); + return IOU_OK; +} diff --git a/io_uring/truncate.h b/io_uring/truncate.h new file mode 100644 index 000000000000..ab17cb9acc90 --- /dev/null +++ b/io_uring/truncate.h @@ -0,0 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 + +int io_truncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); +int io_truncate(struct io_kiocb *req, unsigned int issue_flags); -- 2.34.1